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Table of Contents 10 Wonderful Facts about Whales Types of Whales What do whales eat? Where do Whales Live How Do Whales Communicate? How big are Whales? Do whales sleep? Baby Whales Whale Migration Types of whales Baleen whales Beluga whales Blue Whales Grey whales Killer whales Killer whales Several Interesting Facts about Orca Whales Sperm whales Whales and Dolphins: Endangered Whales Publisher Whales are largest aquatic mammals. They breathe through lungs unlike other animals which breathe through gills. Whales have streamlined bodies. This enables them to move or swim freely through water .in fact, they are the only mammals known to live in water as well as adapted to stay in the open oceans.show more